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# 3.6 Short "Captive" Columns

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There are no columns with height-to-depth ratios less than 75 percent of the nominal height-to-depth ratios of the typical columns at that level.

The deficiency is in the tendency of short captive columns to attract high shear forces because of their high stiffness relative to adjacent elements. Calculate the story drift, and determine the shear demand (

*V*_{e}) in the short column caused by the drift (*V*_{e}*= 2M/L*). The ratio of*V*_{e}*/V*_{n}shall be less than one, where*V*_{n}is the column nominal shear capacity computed in accordance with ACI criteria. Conforming buildings which fail these checks shall be placed in SPC 4.### Related Code Sections

3.6 Seismic Evaluation Procedures for Hospital Buildings, Short "Captive" Columns

The deficiency is in the tendency of

*short**captive**columns*to attract high shear forces because of their high stiffness relative to adjacent elements ...3.6 Seismic Evaluation Procedures for Hospital Buildings, Short "Captive" Columns

The deficiency is in the tendency of

*short**captive**columns*to attract high shear forces because of their high stiffness relative to adjacent elements ...3.6 Seismic Evaluation Procedures for Hospital Buildings, Short "Captive" Columns

The deficiency is in the tendency of

*short**captive**columns*to attract high shear forces because of their high stiffness relative to adjacent elements ...1.8.2 Seismic Evaluation Procedures for Hospital Buildings,

). Adjacent buildings (Section 3.4).

*Short**captive**column*(Section 3.6). Material deterioration (Section 3.7). Weak*columns*(Sections 4.2.8 and 4.3.6 ...1.8.2 Seismic Evaluation Procedures for Hospital Buildings,

). Adjacent buildings (Section 3.4).

*Short**captive**column*(Section 3.6). Material deterioration (Section 3.7). Weak*columns*(Sections 4.2.8 and 4.3.6 ...